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Finding the Fourth Proportional to 888.57, 1,224.56 and 639.46

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Solution

The fourth proportional to 888.57, 1,224.56 and 639.46 is: 881.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.57 : 1,224.56 = 639.46 : x
  2. Step 2: Convert to fraction form
    888.57/1,224.56 = 639.46/x
  3. Step 3: Cross multiply
    888.57x = 1,224.56 × 639.46
  4. Step 4: Simplify right side
    888.57x = 783,060.27
  5. Step 5: Solve for x
    x = 783,060.27/888.57
  6. Step 6: Final answer
    x = 881.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.